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Old 06-13-2011, 11:55 AM   #11 (permalink)
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Originally Posted by cfg83 View Post
CapriRacer -



I didn't know that. That implies (to me) that a 44 PSI max tire would blow up at around 132+ PSI (3 * 44).

CarloSW2
IF they derate linearly. And IF truck tire construction scales to passenger car tires.

I'm not saying they are bad assumptions, just that they are assumptions.

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Old 06-13-2011, 04:11 PM   #12 (permalink)
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I don't think they scale. Truck tires: 12+ plies, tapered bead, steel belted sidewalls.90-120 psi Average passenger tire: 4 plies, nylon, rayon, polyester.........sidewall. 35 to 51 psi.
As far as inflation goes.....most cheapo/ non low profile tires (65+ sidewall) tend to wear the edges of the tires anway. So max inflation or over-inflation will make them wear better. Low profile tires have stiffer sidewalls to make up for decreased air volume (load capacity) and are more prone to uneven wear due to over or under-inflation. Sidewalls are considerably stiffer than the span between them (tread).
Lo pro (225/55/17)inflation is more like a dighragm - sidewalls like surrounding frame, tread like the diaphragm.
Standard / Touring tires (225/70/15)inflate more like a balloon.
If anyone has seen the Modern Marvels episode on Disneyworld, their stunt team runs 80psi in their regular tires on the stunt vehicles. This reduces the contact patch for easier tire spinning and turns with the parking brake. Do what you will with that info.
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Old 06-13-2011, 04:22 PM   #13 (permalink)
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Originally Posted by hoopty_yo View Post
If anyone has seen the Modern Marvels episode on Disneyworld, their stunt team runs 80psi in their regular tires on the stunt vehicles. This reduces the contact patch for easier tire spinning and turns with the parking brake. Do what you will with that info.
It was a while ago, but I remember 100psi, and it was at least in part to keep the rim off the ground when driving on two wheels.

Metrompg did some tests and the efficiency gains started tapering off around 40-50psi, so no reason to push it beyond that without your own data:
http://www.metrompg.com/posts/tire-p...resistance.htm
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Old 06-13-2011, 04:31 PM   #14 (permalink)
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When I lived in Colorado, the local high school shop teacher died inflating a split-rim truck tire without a safety cage.
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Old 06-13-2011, 04:44 PM   #15 (permalink)
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yah, that stuff happens. i.e.
Autopsy: Man dies after over-inflated truck tire explodes - Chicago Breaking News

Truck tires are also many times more dangerous when they explode than a car tire given the increase in volume and psi (which equals much more stored energy). I think truck tires are like 52+ liters at 100+ PSI, and there's a lot of them on a truck, go figure.

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